It is narrated from Sayyiduna Ka'b bin Ujrah (may Allah be pleased with him) that the Messenger of Allah (peace and blessings be upon him) went out to the pulpit one day. When he (peace and blessings be upon him) climbed one step (of the pulpit), he said: "Amin." Then he climbed the second step and said: "Amin." Then he climbed the third step and said: "Amin." When he (peace and blessings be upon him) came down from the pulpit and had finished (the sermon), we said: "O Messenger of Allah, today we heard something from you that we had never heard before?" He (peace and blessings be upon him) said: "Did you hear it?" They (the Companions) said: "Yes." He (peace and blessings be upon him) said: "Jibril (peace be upon him) appeared before me when I climbed the first step and said: 'May he be far (from mercy) who finds his parents, or one of them, in old age and they do not cause him to enter Paradise.' I said: 'Amin.' Then he said: 'May he be far (from mercy) before whom I am mentioned and he does not send blessings upon you.' So I said: 'Amin.' Then he said: 'May he be far (from mercy) who reaches Ramadan and is not forgiven.' So I said: 'Amin.'"
Hadith Referenceالمعجم الكبير للطبراني / باب الكاف / 16365